Reverse-valve mechanism for steam-engines.



0. L. LEWIS @L J. W. MOON. REVERSE VALVE MEGHANISM FOR STEAM ENGINES.

APPLICATION FILED 001210. 1913.

1,128,902. Patented JaIL, 1915.

lfb N-nclem FLT/RS cov, PHOTO'LITHH., wAsfnNn/UN, n f

lUNllTFiD @Thrill-.1.312% F GRIN L. LEX/VIS AND JOSEFH W. MOON, OF TOMPKINS, MICHGAN.

BEVERSE-VALVE IVIECEANSM FOR STEAM-ENGINES.

aisance..

Application filed October 10, 1913.

To all whom t may concern Be it lrnown that we, ORIN L. Lnwrs and Josnrrr W'. Moon, citizens of the United States, residing at Tompkins, in the county of Jackson and State of Michigan, have invented certain new and useful Improvements in Reverse-Valve Mechanism for Steanrlngines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rlhis invention relates to reverse gear mechanism for steam engines and one of the principal objects thereof is to provide a valve for reversing` a steam engine.

Another object thereof is to provide a re versing valve situated between the valve seat of the slide valve and the top of the cylinder.

Another object thereof is to provide a reversing valve which may be positively op erated by means of a single direct acting valve rod.

These and other objects may be attained by means of the construction, combination, and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawing in which;

Figure 1, is a longitudinal vertical sectional view taken through the steam chest and cylinder of a locomotive, showing the reversing valve arranged therein. Fig. 2, is a top plan view showing the steam chest in dotted lines and the slide valve removed.

Fig. 3, is a view similar to Fig. 2, showing the slide valve seat removed. Fig. 11, is a view similar to Fig. 2, showing the reversing valve removed.

ln the embodiment illustrated, the cylinder 1 is shown with the cylinder heads removed and is provided on the top thereof with the usual steam chest 2 having a top 3 thereon secured in the usual manner. As shown the top of the cylinder 1 is slightly raised as at l at the central portion thereof to provide a seat for the reversing valve 5 which is circular in formation and provided on one side thereof with an outwardly extending lug 6, to, the outer end of which is pivoted one end of a link 7 the other end of the linlr being pivoted to one end of the valve rod 8. As shown, the inner end of the link 7 is provided with a downwardly extending lug 9 for engaging with an opening in the outer end of the lug 6, the outer end Speccation of Letters Patent.

Patented dan. 5, 1915.

Serial No. 794,533.

of the link 7 being curved downwardly and outwardly and pivoted by a bolt l to the valve rod 8. rThis rod enters the steam chest at a point near the'lower side thereof and to one side of the center thereof, through a packing box 11, of any preferred construction. rlhe valve has formed in this upper face a pair of oppositely disposed semi-oircular grooves l2 and 13 spaced from the outer periphery of the valve by the walls 14 and having their ends separated by the walls 15 and 16. Extending vertically through the body of the valve 5, adjacent the wall 16, is a valve opening 17 and a corresponding opening 18 is provided adjacent the wall 15, said openings being diametrically opposed and of a substantially wedge shape. As shown the lower side of the valve 5 is perfectly plain and rests against the valve seat l for rotation thereon.

The cylinder 1, is provided with the usual steam ducts 19 and 20 extending in the upper wall of the cylinder, from the valve seat 4L in opposite directions to points adjacent the ends of the cylinder 1, in a well known manner. The upper wall of the cylinder is provided centrally of the valve seat l1 with a circular socket 21 extending from the valve seat to a point near the bore of the cylinder and connecting at its lower end with the exhaust duct 22, thus forming an exhaust port for the cylinder. Seated for rotation in the socket is a stem 23 formed integral with the valve 5, and extending downwardly to a point level with the upper edge of the exhaust duct 22. The upper side of the valve 5 is formed with a sleeve 24 integral with the valve, and forming therewith a shoulder 25 which co-acts with the walls 14 for supporting the slide valve seat 26, the said sleeve being seated for rotation in a circular opening centrally of the valve seat 26 and having its upper end flush with the upper face of said valve seat. Extend ing vertically through the sleeves 241 and 23 and through the body of the valve 5, is a bore 27 communicating at its lower end with the duct 22, and at its upper end with the slide valve 28, thus forming a conduit through which steam from the cylinder may be exhausted.

The slide valve seat 26 abuts at its corners against the enlarged corners 29 of the steam chest 2 and is secured to pins 30 extending upwardly from the bottom of the steam chest. 'lhe slide valve 28 is of the usual well known construction and is provided with the usual valve stem 31 extending through a packing box 32 in the steam chest, which may be of any well known construction but which is here shown as providing a threaded lug 33 having its outer end beveled inwardly; and a threaded cap 34 secured on the lug 33 and provided with an oppositely disposed inwardly 4beveled face between which and the beveled end of the lug 33, is situated the packing 35. The packing box 11 is formed in the same manner.

The upper face of the valve seat 4 is provided with the oppositely disposed curved grooves 36 and 37 situated immediately7 below and corresponding in shape and contour with the slots 12 and 13 in the valve 5, and connect at points 33 and 39 with the inner ends of the steam ducts 19 and 2O respectively. The walls 40 and 41 correspondingwith the walls 15 and 16 of the valve 5, separate the ends of the slots in the valve seat 4. rWhen the valve 5 is positioned as shown in Figs. 1 and 3, the steam passes through a slot opening 42 in the forward end of the slide valve seat 26 down into the slot 12 of the valve 5, down through the opening 17 therein, through the slot 37 in the valve seat 4, and thence through the duct 20 into the rear end of the cylinder 1. Upon the return of the piston (not shown) toward the forward end of the cylinder, steam which has previously been admitted into that end, is exhausted up through the duct 19 into and through the slot 36 in the valve seat 4, up through the opening 18 in the valve 5, through the slot 13 therein, up through the opening 43 in the rear end of the valve seat 26 and corresponding with the opening 42 therein, under the slide valve 28, down through the bore 27 in the valve 5 and out through the exhaust duct 22. Upon pulling the rod 8 backwardly the valve 5 vis rotated rearwardly thus registering the opening 18 in the valve with the slot 37, in the valve seat instead of the slot 36 therein, and registering the opening 17 in the valve with the slot 36 in the valve seat 4 instead of the slot 37 therein, thus causing the steam to first enter the forward end of the cylinder when the slide valve 28 is positioned as shown, instead of the rear end of the cylinder and thus reversing the engine, the exhausted steam finding its way out through the duct 2O instead of through the duct 19 as when the valve is in the position shown. Steam is admitted into the steam chest above the valve sea-t 26 and on the outside of the slide valve 28 in any well known manner (not shown).

It will be noticed that the shape of the openings 18 and 17 in the valve 5 corresponds exactly with the walls 40 and 41 in the valve seat 4, so that when the valve is rotated half way the walls 40 and 41 will close the openings 18 and 17 thus making it impossible for steam to be admitted into the cylinder without shifting the valve in one direction or the other. As is obvious, when the valve is in the neutral position and the openings 18 and 17 are closed, the engine cannot be run.

Although we have described the preferred embodiment of our invention we reserve, and may exercise, the right to make such changes in the construction, combination, and arrangement of parts as do not depart from the spirit of the invention and the scope of the appended claims.

lNe claim:

1. In a reversing valve mechanism for steam engines the combination with a piston cylinder having a socket formed in the top thereof, of oppositely disposed arcuate inlet and outlet ports formed in the top of said cylinder in proximity to said socket, ducts communicating with said ports and said cylinder at the opposite ends of the latter, a slide valve seat spaced from the top of said cylinder and having inlet and outlet ports in alinement with first named ports, a rotary disk valve positioned between said cylinder and said slide valve seat for controlling the communication between rthe two sets of ports and an integral stem formed on said disk valve to rotatably seat the same in said socket.

2. In a reversing valve mechanism for steam engines the combination with a piston cylinder having a socket formed in the top thereof, and an exhaust port communicating with said socket of oppositely disposed arcuate inlet and outlet ports formed in the top of said cylinder in proximity to said socket, ducts communicating with said ports and said cylinder at the opposite ends of the latter, a slide valve seat spaced from the top of said cylinder and having inlet and outlet ports in alinement with first named ports, a rotary disk valve positioned between said cylinder and said slide vvalve seat for controlling the communication between the two sets of ports and an integral stem formed on said disk valve to rotatably seat the same in said socket, said stem being apertured to communicate with said exhaust port and one of the ports controlled by said slide valve.

3. In a reversing valve mechanism including a piston cylinder having oppositely disposed arcuate ports formed in the top thereof, ducts connecting said ports with said cylinders at either end of the latter, a disk valve formed with oppositely disposed arcuate grooves rotatably mounted on said cylinder and having oppositely disposed openings connecting said grooves with said cylinder ports, a slide valve seat positioned above said disk valve and means for partially rotating said valve to shift the comvalve seat and said cylinder ports and means for partially rotating said disk valve to transpose such communication.

1n testimony whereof we have signed our names to this speciication in the presence of two subscribing witnesses.

ORIN L. LEWIS. JOSEPH W. MOON.

Witnesses:

ERMoN FISH, WM. R. DWIGHT.

Copies of this patent may be obtained in! five cents each, by addressing the Commissoneil of Patentso Washington. D. (l 

